Definitions

1. noun

a dome or vaulted structure, especially the upper part of a church or temple, forming the roof or covering the interior of the nave or chancel

“The beautiful cupula of the cathedral dominated the city’s skyline.”

2. noun

the upper part of the eye, especially the transparent, dome-shaped structure at the front of the eyeball that contains the lens

“The doctor examined the patient’s cupula to check for any damage.”